CVE-2025-40305 (GCVE-0-2025-40305)

Vulnerability from cvelistv5 – Published: 2025-12-08 00:46 – Updated: 2025-12-08 00:46
VLAI?
Summary
In the Linux kernel, the following vulnerability has been resolved: 9p/trans_fd: p9_fd_request: kick rx thread if EPOLLIN p9_read_work() doesn't set Rworksched and doesn't do schedule_work(m->rq) if list_empty(&m->req_list). However, if the pipe is full, we need to read more data and this used to work prior to commit aaec5a95d59615 ("pipe_read: don't wake up the writer if the pipe is still full"). p9_read_work() does p9_fd_read() -> ... -> anon_pipe_read() which (before the commit above) triggered the unnecessary wakeup. This wakeup calls p9_pollwake() which kicks p9_poll_workfn() -> p9_poll_mux(), p9_poll_mux() will notice EPOLLIN and schedule_work(&m->rq). This no longer happens after the optimization above, change p9_fd_request() to use p9_poll_mux() instead of only checking for EPOLLOUT.
Severity ?
No CVSS data available.
Assigner
References
Impacted products
Vendor Product Version
Linux Linux Affected: 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 , < 2e1461034aef99e905a1fe5589aaf00eaea73eee (git)
Affected: 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 , < 242531004d7de8c159f9bfadebe33fe8060b1046 (git)
Affected: 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 , < e8fe3f07a357c39d429e02ca34f740692d88967a (git)
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    Linux Linux Unaffected: 6.12.58 , ≤ 6.12.* (semver)
Unaffected: 6.17.8 , ≤ 6.17.* (semver)
Unaffected: 6.18 , ≤ * (original_commit_for_fix)
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{
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          "product": "Linux",
          "programFiles": [
            "net/9p/trans_fd.c"
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      "descriptions": [
        {
          "lang": "en",
          "value": "In the Linux kernel, the following vulnerability has been resolved:\n\n9p/trans_fd: p9_fd_request: kick rx thread if EPOLLIN\n\np9_read_work() doesn\u0027t set Rworksched and doesn\u0027t do schedule_work(m-\u003erq)\nif list_empty(\u0026m-\u003ereq_list).\n\nHowever, if the pipe is full, we need to read more data and this used to\nwork prior to commit aaec5a95d59615 (\"pipe_read: don\u0027t wake up the writer\nif the pipe is still full\").\n\np9_read_work() does p9_fd_read() -\u003e ... -\u003e anon_pipe_read() which (before\nthe commit above) triggered the unnecessary wakeup. This wakeup calls\np9_pollwake() which kicks p9_poll_workfn() -\u003e p9_poll_mux(), p9_poll_mux()\nwill notice EPOLLIN and schedule_work(\u0026m-\u003erq).\n\nThis no longer happens after the optimization above, change p9_fd_request()\nto use p9_poll_mux() instead of only checking for EPOLLOUT."
        }
      ],
      "providerMetadata": {
        "dateUpdated": "2025-12-08T00:46:30.327Z",
        "orgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
        "shortName": "Linux"
      },
      "references": [
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          "url": "https://git.kernel.org/stable/c/2e1461034aef99e905a1fe5589aaf00eaea73eee"
        },
        {
          "url": "https://git.kernel.org/stable/c/242531004d7de8c159f9bfadebe33fe8060b1046"
        },
        {
          "url": "https://git.kernel.org/stable/c/e8fe3f07a357c39d429e02ca34f740692d88967a"
        }
      ],
      "title": "9p/trans_fd: p9_fd_request: kick rx thread if EPOLLIN",
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    }
  },
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    "assignerShortName": "Linux",
    "cveId": "CVE-2025-40305",
    "datePublished": "2025-12-08T00:46:30.327Z",
    "dateReserved": "2025-04-16T07:20:57.185Z",
    "dateUpdated": "2025-12-08T00:46:30.327Z",
    "state": "PUBLISHED"
  },
  "dataType": "CVE_RECORD",
  "dataVersion": "5.2",
  "vulnerability-lookup:meta": {
    "nvd": "{\"cve\":{\"id\":\"CVE-2025-40305\",\"sourceIdentifier\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\",\"published\":\"2025-12-08T01:16:02.700\",\"lastModified\":\"2025-12-08T18:26:19.900\",\"vulnStatus\":\"Awaiting Analysis\",\"cveTags\":[],\"descriptions\":[{\"lang\":\"en\",\"value\":\"In the Linux kernel, the following vulnerability has been resolved:\\n\\n9p/trans_fd: p9_fd_request: kick rx thread if EPOLLIN\\n\\np9_read_work() doesn\u0027t set Rworksched and doesn\u0027t do schedule_work(m-\u003erq)\\nif list_empty(\u0026m-\u003ereq_list).\\n\\nHowever, if the pipe is full, we need to read more data and this used to\\nwork prior to commit aaec5a95d59615 (\\\"pipe_read: don\u0027t wake up the writer\\nif the pipe is still full\\\").\\n\\np9_read_work() does p9_fd_read() -\u003e ... -\u003e anon_pipe_read() which (before\\nthe commit above) triggered the unnecessary wakeup. This wakeup calls\\np9_pollwake() which kicks p9_poll_workfn() -\u003e p9_poll_mux(), p9_poll_mux()\\nwill notice EPOLLIN and schedule_work(\u0026m-\u003erq).\\n\\nThis no longer happens after the optimization above, change p9_fd_request()\\nto use p9_poll_mux() instead of only checking for EPOLLOUT.\"}],\"metrics\":{},\"references\":[{\"url\":\"https://git.kernel.org/stable/c/242531004d7de8c159f9bfadebe33fe8060b1046\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\"},{\"url\":\"https://git.kernel.org/stable/c/2e1461034aef99e905a1fe5589aaf00eaea73eee\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\"},{\"url\":\"https://git.kernel.org/stable/c/e8fe3f07a357c39d429e02ca34f740692d88967a\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\"}]}}"
  }
}


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